<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button>停止</button>
    <script>
        var btn = document.querySelector('button');
        var timer = setTimeout(function () {
            console.log("爆炸了");
        }, 5000)
        btn.addEventListener('click', function () {
            //停止计时器 clearTimeout(定时器的名字)
            clearTimeout(timer)
        })


    </script>
</body>

</html>